200cm 3 of hydrogen were collected over water at 30 °C and 740mmHg. Calculate the
CHEMISTRY
POST UTME OAU
200cm3 of hydrogen were collected over water at 30 °C and 740mmHg. Calculate the volume of the gas at s.t.p. if the vapour pressure of water at the temperature of the experiment is 14mmHg.
- A) 168.25cm3
- B)176.40cm3
- C) 185.46cm3
- D) 172.14cm3
Correct Answer: D) 172.14cm3
Explanation
To explain this question, we need to understand the concept of gas laws, particularly the combined gas law, which relates the pressure, volume, and temperature of a gas. The combined gas law formula is:
\[\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\]
Where \(P_1\) and \(P_2\) are the initial and final pressures, \(V_1\) and \(V_2\) are the initial and final volumes, and \(T_1\) and \(T_2\) are the initial and final temperatures.
In this problem, we are given the volume of hydrogen gas (\(V_1\)) collected over water at 30
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